/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.solr.servlet;

import java.io.File;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.apache.solr.common.SolrException;
import org.apache.solr.common.params.CommonParams;
import org.apache.solr.common.params.MapSolrParams;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.ContentStream;
import org.apache.solr.common.util.ContentStreamBase;
import org.apache.solr.core.CoreContainer;
import org.apache.solr.core.CoreDescriptor;
import org.apache.solr.core.SolrConfig;
import org.apache.solr.core.SolrCore;
import org.apache.solr.core.SolrResourceLoader;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.request.SolrRequestHandler;
import org.apache.solr.response.QueryResponseWriter;
import org.apache.solr.response.SolrQueryResponse;
import org.apache.solr.schema.IndexSchema;

/**
 * DirectSolrConnection provides an interface to Solr that is similar to
 * the the HTTP interface, but does not require an HTTP connection.
 * 
 * This class is designed to be as simple as possible and allow for more flexibility
 * in how you interface to Solr.
 * 
 * @version $Id: DirectSolrConnection.java 1128442 2011-05-27 20:15:59Z mikemccand $
 * @since solr 1.2
 */
public class DirectSolrConnection 
{
//	
//  final SolrCore core;
//  final SolrRequestParsers parser;
//  
//  /**
//   * Initialize using the static singleton SolrCore.getSolrCore().
//   * 
//   * @deprecated use {@link #DirectSolrConnection(SolrCore)}
//   */
//  @Deprecated
//  public DirectSolrConnection()
//  {
//    this( SolrCore.getSolrCore() );
//  }
//
//  /**
//   * Initialize using an explicit SolrCore
//   */
//  public DirectSolrConnection( SolrCore c )
//  {
//    core = c;
//    parser = new SolrRequestParsers( c.getSolrConfig() );
//  }
//
//  /**
//   * This constructor is designed to make it easy for JNI embedded applications 
//   * to setup the entire solr environment with a simple interface.  It takes three parameters:
//   * 
//   * <code>instanceDir:</code> The solr instance directory.  If null, it will check the standard 
//   * places first (JNDI,properties,"solr" directory)
//   * 
//   * <code>dataDir:</code> where the index is stored. 
//   * 
//   * <code>loggingPath:</code> Path to a java.util.logging.config.file.  If the path represents
//   * an absolute path or is relative to the CWD, it will use that.  Next it will try a path 
//   * relative to the instanceDir.  If none of these files exist, it will error.
//   */
//  public DirectSolrConnection( String instanceDir, String dataDir, String loggingPath )
//  {
//    // If a loggingPath is specified, try using that (this needs to happen first)
//    if( loggingPath != null ) {
//      File loggingConfig = new File( loggingPath );
//      if( !loggingConfig.exists() && instanceDir != null ) {
//        loggingConfig = new File( new File(instanceDir), loggingPath  );
//      }
//      if( loggingConfig.exists() ) {
//        System.setProperty("java.util.logging.config.file", loggingConfig.getAbsolutePath() ); 
//      }
//      else {
//        throw new SolrException( SolrException.ErrorCode.SERVER_ERROR, "can not find logging file: "+loggingConfig );
//      }
//    }
//    
//    if( instanceDir == null ) {
//      instanceDir = SolrResourceLoader.locateInstanceDir();
//    }
//    
//    // Initialize 
//    try {
//      CoreContainer cores = new CoreContainer(new SolrResourceLoader(instanceDir));
//      SolrConfig solrConfig = new SolrConfig(instanceDir, SolrConfig.DEFAULT_CONF_FILE, null);
//      CoreDescriptor dcore = new CoreDescriptor(cores, "", solrConfig.getResourceLoader().getInstanceDir());
//      IndexSchema indexSchema = new IndexSchema(solrConfig, instanceDir+"/conf/schema.xml", null);
//      core = new SolrCore( null, dataDir, solrConfig, indexSchema, dcore);
//      cores.register("", core, false);
//      parser = new SolrRequestParsers( solrConfig );
//    } 
//    catch (Exception ee) {
//      throw new RuntimeException(ee);
//    }
//  }
//  
//
//  /**
//   * For example:
//   * 
//   * String json = solr.request( "/select?qt=dismax&wt=json&q=...", null );
//   * String xml = solr.request( "/update", "&lt;add><doc><field ..." );
//   */
//  public String request( String pathAndParams, String body ) throws Exception
//  {
//    String path = null;
//    SolrParams params = null;
//    int idx = pathAndParams.indexOf( '?' );
//    if( idx > 0 ) {
//      path = pathAndParams.substring( 0, idx );
//      params = SolrRequestParsers.parseQueryString( pathAndParams.substring(idx+1) );
//    }
//    else {
//      path= pathAndParams;
//      params = new MapSolrParams( new HashMap<String, String>() );
//    }
//    
//    // Extract the handler from the path or params
//    SolrRequestHandler handler = core.getRequestHandler( path );
//    if( handler == null ) {
//      if( "/select".equals( path ) || "/select/".equalsIgnoreCase( path) ) {
//        String qt = params.get( CommonParams.QT );
//        handler = core.getRequestHandler( qt );
//        if( handler == null ) {
//          throw new SolrException( SolrException.ErrorCode.BAD_REQUEST, "unknown handler: "+qt);
//        }
//      }
//    }
//
//    if( handler == null ) {
//      throw new SolrException( SolrException.ErrorCode.BAD_REQUEST, "unknown handler: "+path );
//    }
//
//    return request(handler, params, body);
//  }
//
//  public String request(SolrRequestHandler handler, SolrParams params, String body ) throws Exception {
//
//    if (params == null)
//      params = new MapSolrParams( new HashMap<String, String>() );
//
//    // Make a stream for the 'body' content
//    List<ContentStream> streams = new ArrayList<ContentStream>( 1 );
//    if( body != null && body.length() > 0 ) {
//      streams.add( new ContentStreamBase.StringStream( body ) );
//    }
//
//    SolrQueryRequest req = null;
//    try {
//      req = parser.buildRequestFrom( core, params, streams );
//      SolrQueryResponse rsp = new SolrQueryResponse();
//      core.execute( handler, req, rsp );
//      if( rsp.getException() != null ) {
//        throw rsp.getException();
//      }
//
//      // Now write it out
//      QueryResponseWriter responseWriter = core.getQueryResponseWriter(req);
//      StringWriter out = new StringWriter();
//      responseWriter.write(out, req, rsp);
//      return out.toString();
//    } finally {
//      if (req != null) {
//        req.close();
//      }
//    }
//  }
//  
//  /**
//   * Use this method to close the underlying SolrCore.
//   * 
//   * @since solr 1.3
//   */
//  public void close() {
//    core.close();
//  }
}
